Plan B Affecting Period

Plan B Affecting Period

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Can Plan B make your period late or cause bleeding?

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Medically reviewed by Sally Chao, MD . Last updated on July 30, 2021.
Yes, Plan B ( levonorgestrel ) can delay your period or cause bleeding to occur outside of regular menstrual bleeding because levonorgestrel is a synthetic hormone. To prevent pregnancy, Plan B, like other birth control pills, must alter your hormone levels, which can prompt these menstrual changes. Plan B is associated with more menstrual changes than regular birth control pills because the dosage is higher.
In a clinical trial, 31% of participants experienced some change in their menstrual cycle after taking Plan B, but the potential menstrual changes are varied. Plan B may cause some women to experience heavier or lighter menstrual bleeding compared to their regular periods.
After taking Plan B, some women get their period sooner than expected, while others get it later. However, clinical trial data suggest most women will get their period within two days to one week of the anticipated time. Women who take Plan B and experience a delay in their period greater than one week are recommended to take a pregnancy test.
During your menstrual cycle, the time at which Plan B is taken can affect how your menstruation changes.
Nonmenstrual bleeding, or spotting, can also occur after using Plan B. Clinical trial data show that 16% of participants experienced spotting in the first week after taking Plan B. Similarly, in one study of 232 women who took Plan B, just under 15% experienced spotting. In this study group, the bleeding typically started around 4 days after Plan B was takenand lasted an average of 2.4 days, with a range of one to seven days. Some women began spotting as early as 8 hours after taking Plan B.
Menstrual changes and irregular bleeding associated with Plan B should go away without treatment. In one study of 132 women, most women returned to their normal cycle length in the next cycle following the use of Plan B. However, those who took Plan B later on in their cycle (after ovulation) had a slightly longer next cycle on average.
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Drugs.com provides accurate and independent information on more than 24,000 prescription drugs, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. Data sources include IBM Watson Micromedex (updated 5 July 2022), Cerner Multum™ (updated 27 June 2022), ASHP (updated 16 May 2022) and others.
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